“Seine” is also a German word meaning the pronoun “his” or “its”, indicating a [m/n]'s ownership/relation to [f/pl]. (Brackets indicate grammatical gender of the subject/object that make seiner inflect into seine.)

Examples:

• Seine Eltern kommen aus Polen. His parents come from Poland.
• Das Schaf lasste seine Wolle geschnitten werden. The sheep let its wool get cut.